221014421 has 2 divisors, whose sum is σ = 221014422. Its totient is φ = 221014420.

The previous prime is 221014397. The next prime is 221014427. The reversal of 221014421 is 124410122.

221014421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220671025 + 343396 = 14855^2 + 586^2 .

It is a cyclic number.

It is not a de Polignac number, because 221014421 - 2²² = 216820117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221014421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221014427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110507210 + 110507211.

It is an arithmetic number, because the mean of its divisors is an integer number (110507211).

Almost surely, 2^221014421 is an apocalyptic number.

It is an amenable number.

221014421 is a deficient number, since it is larger than the sum of its proper divisors (1).

221014421 is an equidigital number, since it uses as much as digits as its factorization.

221014421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 221014421 is about 14866.5537701244. The cubic root of 221014421 is about 604.6075099265.

Adding to 221014421 its reverse (124410122), we get a palindrome (345424543).

The spelling of 221014421 in words is "two hundred twenty-one million, fourteen thousand, four hundred twenty-one".